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AR9 Pistol Kit - 10.5" Parkerized M4 Barrel, 1:10 Twist Rate with 9.5" MLOK Handguard

Out of Stock

Take the guesswork out of building a high-performance AR9.

Assembling a reliable, accurate 9mm AR-15 can be tricky. The AR9 uses plenty of AR-15 parts, while also using some specific 9mm components. We've taken out the guesswork with this 10.5" 9mm AR build kit: Featuring a quality 4150 CMV barrel with a 1:10 twist, it affords maximum muzzle velocity and accuracy downrange.

Inside, you're getting the perfect setup to ensure your AR9 runs smoothly: A 9mm-specific bolt carrier group, featuring a custom billet upper with a side-charging handle, and a tuned 9mm buffer assembly that mitigates recoil and ensures reliable blowback functionality. The free-float M-LOK handguard sports front and rear Picatinny rails for installing optics and iron sights with ease.


  • Chamber: 9mm
  • Contour: M4/Government
  • Length: 10.5"
  • Twist Rate: 1:10
  • Gas System: Blowback
  • Muzzle Threads: 1/2 x 36
  • Material: 4150 CMV
  • Finish: Parkerized
  • Process: Button Rifled
  • Lining: None
  • Feed Ramp: 9mm
  • Muzzle: "Twisted" Flash Hider


  • Attachment System: M-LOK
  • Handguard Length: 9.5"
  • Finish: Type III Hardcoat Anodized (Mil-Spec)
  • Top Rail: M1913 Picatinny
  • Material: Billet 6061-T6 Aluminum
  • Attachment: Barrel Nut 

Upper Receiver

  • Profile: M4 Flattop Right-Side Charger
  • Material: Billet 6061-T6 Aluminum
  • Finish: Type III Hardcoat Anodized (Mil-Spec)

Bolt Carrier Group

  • Profile: M16/Full-Auto
  • Steel: AISI E9310
  • Exterior: Black Nitride
  • Interior: Black Nitride
  • Gas Key: N/A
  • Charging Handle: Included, Right-Side Charging

Lower Receiver Parts

  • Buffer System: 9mm
  • Pistol Brace: SBA3 5-Position
  • Parts Kit: 9mm, Single-Stage Trigger

Lower receiver not included. Requires AR9 lower, or AR-15 lower with 9mm conversion block.

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Shipping Restrictions

Shipping of various parts and/or accessories are prohibited to states and locales (ie New Jersey, California, New York, etc…) with restrictions against certain parts and/or accessories or "assault weapons" (i.e. states with high-capacity magazine restrictions, manufacturing of semi-automatic weapons, etc..). It is your responsibility to be aware of your local firearms laws before purchasing from our website or machining a firearm. We try our best to keep our shipping page current, but laws change daily. only ships within the United States. Federal legislation dictates we cannot ship our products internationally.

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We are a national retailer of individual components and not all products depicted on this website are legal in every state. Shipping of various products found on this website are prohibited to some states (such as California, Connecticut, District of Columbia, Hawaii, New Jersey, New York, Rhode Island, and Washington). The information, pictures, text or products presented on this website are not a representation by us, and should not be understood by you, that any product or completed firearm is legal to assemble or own in your state of residence. We encourage each and every builder to perform their own research about the state and federal laws that apply to them. It is your responsibility to understand the law and we encourage you to consult with an attorney or your local ATF representative.